Identify a technique of integration for evaluating the integral. If necessary, explain how to first simplify the integrand before applying the suggested technique of integration. You do not need to evaluate the integral.
A. Integrate by parts with u = 3x, dv = cos 2x dx
B. Substitute, letting u = cos 2x
C. Integrate by parts with u = cos 2x, dv = 3x dx
D. Substitute, letting u = 2x
Answer: A
Mathematics
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